CN202083729U - An automatic range conversion device - Google Patents
An automatic range conversion device Download PDFInfo
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- CN202083729U CN202083729U CN2011201271479U CN201120127147U CN202083729U CN 202083729 U CN202083729 U CN 202083729U CN 2011201271479 U CN2011201271479 U CN 2011201271479U CN 201120127147 U CN201120127147 U CN 201120127147U CN 202083729 U CN202083729 U CN 202083729U
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 17
- 238000004891 communication Methods 0.000 claims abstract description 13
- 238000005259 measurement Methods 0.000 abstract description 10
- 238000012544 monitoring process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The utility model relates to an automatic range switching device. An input socket is connected with a pin J1 of a signal input circuit, output of the signal input circuit is connected to a fourth pin of a range switching circuit programmable operational amplifier PGA103mu, the range switching circuit programmable operational amplifier PGA103mu is connected with a first pin and a second pin of a single chip microcomputer via a 74LS00, a range switching circuit is respectively connected to two contacts of a 4007 in a protecting circuit, the two contacts of the 4007 in the protecting circuit are connected with an A/D (analog/digital) conversion circuit chip AD574, and a single chip microcomputer system is connected to a second pin of an over-range and overtime alarm circuit Q29014 and respectively connected to level switching chips in an RS-232C serial communication circuit. The automatic range switching device has the advantages that the automatic range switching device is wide in measurement range, high in measurement resolution, measurement precision and cost performance, fine in safety performance and fast in response speed, realizes an over-range and overtime alarm function, and has two output modes including display and serial communication.
Description
Technical field
The utility model relates to a kind of analog-digital commutator; particularly relate to a kind of be used for data acquisition system (DAS), sensor, monitoring; have that overvoltage protection, range are changed automatically, a kind of automatic range conversion equipment of the high precision of demonstration and RS-232C communication interface, wide region, high performance-price ratio.
Background technology
Existing automatic range conversion equipment, usually have that signal input is narrow, scope is only at unipolarity 0～2V, response speed slow (100us), put that frequent switching, Measurement Resolution and measuring accuracy are low, security is lower and do not have at the range conversion critical and show and shortcomings such as serial communication mode.
The utility model content
The utility model is at the deficiencies in the prior art; a kind of be used for data acquisition system (DAS), sensor, monitoring are provided; have that overvoltage protection, range are changed automatically, the automatic range conversion equipment of the high precision of demonstration and RS-232C communication interface, wide region, high performance-price ratio.
The technical solution adopted in the utility model is:
A kind of automatic range conversion equipment is made up of signal input circuit, range change-over circuit, holding circuit, microcontroller system circuit, A/D change-over circuit, the overtime warning circuit of outrange, RS-232C serial communication circuit, display circuit; It is characterized in that: input socket connects signal input circuit JI pin; The pio chip LM324 of signal input circuit is connected to 4 pin of range change-over circuit transport and placing device PGA103u able to programme by 1 pin, range change-over circuit transport and placing device PGA103u able to programme links to each other with single-chip microcomputer 1,2 pins by 74LS00, is subjected to the anti-phase control of microcontroller system circuit chip 89C51; Range change-over circuit transport and placing device PGA103u able to programme is connected respectively in the holding circuit two contacts of 4007; 4007 two contacts are connected to A/D change-over circuit chip AD574 in the holding circuit; 27 pin are connected to 2 pin of the overtime warning circuit Q2 of outrange (9014) among the microcontroller system circuit chip 89C51; 11,10 pin of microcontroller system circuit chip 89C51 are connected respectively to 11,12 pin of level transferring chip MAX232 in the RS-232C serial communication circuit; Microcontroller system circuit chip 89C51 links to each other with serial display chip ZLG7289 in the display circuit respectively by the socket and the connecting line of two wiring boards.
Above-mentioned holding circuit adopts diode to carry out overvoltage protection, sets protection voltage with electric resistance partial pressure.
The utility model can solve following technical matters:
(1) measurement range is wide, 0～± 200mV, 0～± 2V, 0～± the different measurement range of 20V in, all can reliable measurements; (2) Measurement Resolution and measuring accuracy height, ratio of performance to price height, Measurement Resolution can reach 0.05% of this range, measuring accuracy be this range ± 3%; (3) security is good, and input circuit must have the overload protection ability, carries out overvoltage protection with diode, sets protection voltage with electric resistance partial pressure; (4) response speed is fast, just can find suitable range, sample rate 50u s maximum twice; (5) the overtime warning of outrange; (6) have demonstration and two kinds of way of outputs of serial communication, easy to use, but long-distance transmissions, and link to each other with automatic control system with various data acquisition units easily.
Description of drawings
Fig. 1 is a kind of automatic range conversion equipment of the utility model, structural drawing;
Fig. 2 is a kind of automatic range conversion equipment of the utility model, circuit diagram;
Embodiment
As shown in the figure, a kind of automatic range conversion equipment of the utility model,, form by signal input circuit 1, range change-over circuit 2, holding circuit 3, microcontroller system circuit 4, A/D change-over circuit 5, the overtime warning circuit 6 of outrange, RS-232C serial communication circuit 7, display circuit 8; Input socket J1 connects signal input circuit 1; 1 pin of the pio chip LM324 of signal input circuit 1 is connected to 4 pin of range change-over circuit 2 transport and placing device PGA103u able to programme, and 1,2 pin of range change-over circuit 2 transport and placing device PGA103u able to programme are subjected to the anti-phase control of 1,2 pins of microcontroller system circuit 4 chip 89C51 by 74LS00; 7 pin of range change-over circuit 2 transport and placing device PGA103u able to programme are connected respectively in the holding circuit 3 two contacts of 4007; 4007 two contacts are connected to 14 pin of A/D change-over circuit 5 chip AD574 in the holding circuit 3; 27 pin of microcontroller system circuit 4 chip 89C51 are connected to 2 pin of Q2 (9014) in the overtime warning circuit 6 of outrange; 10,11 pin of microcontroller system circuit 4 chip 89C51 are connected respectively to 12,11 pin of level transferring chip MAX232 in the RS-232C serial communication circuit 7; 3,4,5,13 pin of microcontroller system circuit 4 chip 89C51 link to each other with 6,7,8,9 pins of serial display chip ZLG7289 in the display circuit 8 respectively by the socket and the connecting line of two wiring boards.
Tested voltage is imported through the socket J1 of signal input circuit 1 earlier, range change-over circuit 2 is made up of transport and placing device PGA103u able to programme, enlargement factor is subjected to microcontroller system circuit 4 controls, can amplify 100,10,1, difference correspondence 0～± 200mV, 0～± 2V, 0～± 20V third gear range; Holding circuit 3 mainly is made up of electric resistance partial pressure and two-stage pipe, be the input voltage that makes A/D change-over circuit 5 be limited in-10～10V between, protection A/D change-over circuit 5 chips; The overtime warning circuit 6 of outrange is by microcontroller system circuit 4 control, when input voltage surpassed 20V in 30 seconds or be lower than-the 20V device can report to the police automatically; Display circuit 8 and RS-232C serial communication circuit 7 are used for data output.
When carrying out the range conversion, adopt transport and placing device PGA103u control able to programme, can select the critical point of range conversion, the lifting conversion of self-adaptive processing range automatically; When current range is not only range,,, find suitable range according to the data of this collection if fall range; If rise range, once be raised to the maximum amount journey, fall range again and handle; When selecting range, in order to solve the critical point uncertainty of range conversion, the system of selection of range, solve by given lifting range threshold values return difference, as, 0～± the 2V shelves, when input voltage surpasses 2V, be raised to 0～± the 20V shelves, when input voltage is lower than 1.95V, drop to 0 again～± the 2V shelves; This has just been avoided input voltage when 2V fluctuates, the uncertainty of measurement range selection.
Claims (2)
1. an automatic range conversion equipment is made up of signal input circuit, range change-over circuit, holding circuit, microcontroller system circuit, A/D change-over circuit, the overtime warning circuit of outrange, RS-232C serial communication circuit, display circuit; It is characterized in that: input socket connects signal input circuit JI pin; The pio chip LM324 of signal input circuit is connected to 4 pin of range change-over circuit transport and placing device PGA103u able to programme by 1 pin, and range change-over circuit transport and placing device PGA103u able to programme links to each other with single-chip microcomputer 1,2 pins by 74LS00; Range change-over circuit transport and placing device PGA103u able to programme is connected respectively in the holding circuit two contacts of 4007; 4007 two contacts are connected to A/D change-over circuit chip AD574 in the holding circuit; 27 pin are connected to 2 pin of the overtime warning circuit Q29014 of outrange among the microcontroller system circuit chip 89C51; 11,10 pin of microcontroller system circuit chip 89C51 are connected respectively to 11,12 pin of level transferring chip MAX232 in the RS-232C serial communication circuit; Microcontroller system circuit chip 89C51 links to each other with serial display chip ZLG7289 in the display circuit respectively by the socket and the connecting line of two wiring boards.
2. a kind of automatic range conversion equipment according to claim 1 is characterized in that: above-mentioned holding circuit, and adopt diode to carry out overvoltage protection, set protection voltage with electric resistance partial pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201271479U CN202083729U (en) | 2011-04-22 | 2011-04-22 | An automatic range conversion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201271479U CN202083729U (en) | 2011-04-22 | 2011-04-22 | An automatic range conversion device |
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| Publication Number | Publication Date |
|---|---|
| CN202083729U true CN202083729U (en) | 2011-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201271479U Expired - Fee Related CN202083729U (en) | 2011-04-22 | 2011-04-22 | An automatic range conversion device |
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| CN (1) | CN202083729U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611426A (en) * | 2012-03-23 | 2012-07-25 | 上海信耀电子有限公司 | Automatic digital-to-analog range switching circuit |
| CN102654401A (en) * | 2012-03-31 | 2012-09-05 | 江苏省东方世纪网络信息有限公司 | Adaptive measurement range control method of gyroscopic sensor |
| CN102944712A (en) * | 2012-11-26 | 2013-02-27 | 西安华伟光电技术有限公司 | Multi-range automatic selection device of electronic type current transformer |
| CN103713223A (en) * | 2014-01-03 | 2014-04-09 | 烟台东方威思顿电气有限公司 | Method for flickering measuring of self-adaption range low storage data volume |
| CN104061922A (en) * | 2014-06-23 | 2014-09-24 | Tcl通讯（宁波）有限公司 | Mobile terminal gyroscope range setting method, system and mobile terminal |
| CN107257229A (en) * | 2017-06-30 | 2017-10-17 | 安徽大恒能源科技有限公司 | A kind of high-precision measuring method based on photovoltaic module data monitoring system |
-
2011
- 2011-04-22 CN CN2011201271479U patent/CN202083729U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611426A (en) * | 2012-03-23 | 2012-07-25 | 上海信耀电子有限公司 | Automatic digital-to-analog range switching circuit |
| CN102611426B (en) * | 2012-03-23 | 2014-11-05 | 上海信耀电子有限公司 | Automatic digital-to-analog range switching circuit |
| CN102654401A (en) * | 2012-03-31 | 2012-09-05 | 江苏省东方世纪网络信息有限公司 | Adaptive measurement range control method of gyroscopic sensor |
| CN102944712A (en) * | 2012-11-26 | 2013-02-27 | 西安华伟光电技术有限公司 | Multi-range automatic selection device of electronic type current transformer |
| CN103713223A (en) * | 2014-01-03 | 2014-04-09 | 烟台东方威思顿电气有限公司 | Method for flickering measuring of self-adaption range low storage data volume |
| CN103713223B (en) * | 2014-01-03 | 2016-01-27 | 烟台东方威思顿电气股份有限公司 | A kind of low storage data volume flickering measurement method of self-adaptation range |
| CN104061922A (en) * | 2014-06-23 | 2014-09-24 | Tcl通讯（宁波）有限公司 | Mobile terminal gyroscope range setting method, system and mobile terminal |
| CN107257229A (en) * | 2017-06-30 | 2017-10-17 | 安徽大恒能源科技有限公司 | A kind of high-precision measuring method based on photovoltaic module data monitoring system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111221 Termination date: 20140422 |